added "current" to costume input slot dropdown

HISTORY.md

@@ -67,7 +67,8 @@
 * Blocks, Objects, Threads: new "getImageAttribute" reporter primitive
 * Objects, Threads: let "getImageAttribute" deal with null costumes
 * Objects, Threads: new "stretch" primitive for costumes, also for flipping
-* Threas: new feature: new costume from list of pixels
+* Threads: new feature: new costume from list of pixels
+* Objects, Threads: added "current" to costume input slot dropdown
 
 ### 2019-04-08
 * Blocks, Objects, Threads: new "getSoundAttribute" reporter primitive

src/blocks.js

@@ -8918,6 +8918,7 @@ InputSlotMorph.prototype.costumesMenu = function () {
     } else { // stage
         dict = {Empty : ['Empty']};
     }
+    dict.current = ['current'];
     rcvr.costumes.asArray().forEach(function (costume) {
         allNames = allNames.concat(costume.name);
     });

src/objects.js

@@ -3294,6 +3294,9 @@ SpriteMorph.prototype.doSwitchToCostume = function (id, noShadow) {
         this.wearCostume(id, noShadow);
         return;
     }
+    if (id instanceof Array && (id[0] === 'current')) {
+        return;
+    }
 
     var num,
         arr = this.costumes.asArray(),

src/threads.js

@@ -4338,14 +4338,7 @@ Process.prototype.doSetInstrument = function (num) {
 // Process image processing primitives
 
 Process.prototype.reportGetImageAttribute = function (choice, name) {
-    var cst = name instanceof Costume ? name
-            : (typeof name === 'number' ?
-                    this.blockReceiver().costumes.at(name)
-                : detect(
-                    this.blockReceiver().costumes.asArray(),
-                    function (c) {return c.name === name.toString(); }
-                )
-            ) || new Costume(),
+    var cst = this.costumeNamed(name) || new Costume(),
         option = this.inputOption(choice);
 
     switch (option) {
@@ -4363,18 +4356,11 @@ Process.prototype.reportGetImageAttribute = function (choice, name) {
 };
 
 Process.prototype.reportNewCostumeStretched = function (name, xP, yP) {
+    var cst;
     if (name instanceof List) {
         return this.reportNewCostume(name, xP, yP);
     }
-
-    var cst = name instanceof Costume ? name
-            : (typeof name === 'number' ?
-                    this.blockReceiver().costumes.at(name)
-                : detect(
-                    this.blockReceiver().costumes.asArray(),
-                    function (c) {return c.name === name.toString(); }
-                )
-            );
+    cst = this.costumeNamed(name);
     if (!cst) {
         return new Costume();
     }
@@ -4384,6 +4370,23 @@ Process.prototype.reportNewCostumeStretched = function (name, xP, yP) {
     );
 };
 
+Process.prototype.costumeNamed = function (name) {
+    // private
+    if (name instanceof Costume) {
+        return name;
+    }
+    if (typeof name === 'number') {
+        return this.blockReceiver().costumes.at(name);
+    }
+    if (this.inputOption(name) === 'current') {
+        return this.blockReceiver().costume;
+    }
+    return detect(
+        this.blockReceiver().costumes.asArray(),
+        function (c) {return c.name === name.toString(); }
+    );
+};
+
 Process.prototype.reportNewCostume = function (pixels, width, height) {
     // private
     width = Math.abs(Math.floor(+width));